21048830 has 16 divisors (see below), whose sum is σ = 41332464. Its totient is φ = 7654080.

The previous prime is 21048829. The next prime is 21048857. The reversal of 21048830 is 3884012.

It is a self number, because there is not a number n which added to its sum of digits gives 21048830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95567 + ... + 95786.

It is an arithmetic number, because the mean of its divisors is an integer number (2583279).

Almost surely, 2^21048830 is an apocalyptic number.

21048830 is a deficient number, since it is larger than the sum of its proper divisors (20283634).

21048830 is a wasteful number, since it uses less digits than its factorization.

21048830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191371.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21048830 is about 4587.9003912465. The cubic root of 21048830 is about 276.1060906300.

The spelling of 21048830 in words is "twenty-one million, forty-eight thousand, eight hundred thirty".